UPDATE: **SOLD** Was $350.
Sounds like it still runs.
“Military generator. 120/240 single phase or 120/208 three phase. Name plate is difficult to read but I believe it to be either 13.8 or 15.8kw. Has a flathead 4 Willys engine,antifreeze good to -40, Gasoline. Uses 2 12 volt batteries for start and generator field. Very reliable,but we havent used it in several years so it needs new batteries . Like all military equipment, very heavy.”